you should talk 2 her at least once every other day unless u c her often
talk to them both.
as much as you would to any other person!
Try to talk to the girl before he does to see if you have a chance with her.
Talk to your cousin about this.
you should hang out with him more often
ask her out, or start simple and just talk to her
Like she is a person. (she is one, after all!) After that the rest is up to you.
move on, she's not interested
Things she likes to talk about
It depends on if she likes you and if she does talk about dating
you should probobly find another girl
i am a girl so i know how you feel just try to talk to him and tell him how you feel